Defensive publication

ABSTRACT

THE ELECTROPHOTOGRAPHIC SPEED OF INORGANIC PHOTOCONDUCTOR AND XERORADIOGRAPHIC COMPOSITIONS, SUCH AS THOSE CONTAINING TIO2 AND PBO, CAN BE IMPROVED BY INCLUDING AN ORGANIC PHOTOCONDUCTOR IN THE ELECTROPHOTOGRAPHIC ELEMENT. THE ORGANIC AND INORGANIC PHOTOCONDUCTORS CAN BE IN SEPARATE LAYERS OR IN THE SAME LAYER OF THE ELEMENT. FOR EXAMPLE, A SOLUTION OF 398 G. OF TOLUENE, 52.7 G. OF POLYVINYL BUTYRAL BINDER RESIN, 17.5 TIO2 IS COATED ON A CLAY-COATED CONDUCTIVE PAPER. OVER THE RESULTING LAYER OF TIO2-BINDER RESIN IS COATED AT A WET THICKNESS OF 0.006 INCH A SOLUTION OF 200 G. METHYLENE CHLORIDE, 18 G. POLYCARBONATE BINDER RESIN AND 12 G. OF THE ORGANIC PHOTOCONDUCTOR 4,4&#39;&#39; - DIETHYLAMINO-2,2&#39;&#39;-DIMETHYLTRIPHENYLMETHANE. THE DOUBLE COATED ELEMENT HAS GREATER SEMSITIVITY THAN EITHER THE TIO2 LAYER OR THE ORGANIC PHOTOCONDUCTOR ALONE. THE INCREASE IN SPEED IS GREATER THAN THE CUMULATIVE SPEED OF THE SEPARATE COMPONENTS. SIMILAR IMPROVEMENT OCCURS WHEN THE ORGANIC PHOTOCONDUCTOR (1.0 G. IN 0.5 ML. METHYLENE CHLORIDE) IS ADDED TO 25 ML. OF A TIO2 DISPERSION IN POLYVINYL BUTYRAL RESIN AND COATED AT 0.004 INCH WET THICKNESS ON CONDUCTING PAPER.

EFENSWE PUMCATW UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 0.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Ofiice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED JULY 20, 1971 T888 013 ELECTROPHOTOGRAPHIE SPEED OF INORGANIC PHOTOCONDUCTORS IS INCREASED BY THE ADDITION OF ORGANIC PHOTOCONDUCTORS Paul B. Gilman, Jr., 1669 Lake Ave., Rochester, N.Y. 14615 Filed Nov. 27, 1970, Ser. No. 93,449 Int. Cl. 603g 5 06, 5 /08 US. Cl. 96]l.5 No Drawing. 19 Pages Specification The electrophotographic speed of inorganic photoconductor and xeroradiographic compositions, such as those containing TiO and PM), can be improved by including an organic photoconductor in the electrophotographic element. The organic and inorganic photoconductors can be in separate layers or in the same layer of the element. For example, a solution of 398 g. of toluene, 52.7 g. of polyvinyl butyral binder resin, 17.5 TiO is coated on a clay-coated conductive paper. Over the resulting layer of TiO -binder resin is coated at a wet thickness of 0.006 inch a solution of 200 g. methylene chloride, 18 g. polycarbonate binder resin and 12 g. of the organic photoconductor 4,4 diethylamino-2,2'-dimethyltriphenylmethane. The double coated element has greater sensitivity than either the TiO layer or the organic photoconductor alone. The increase in speed is greater than the cumulative speed of the separate components. Similar improvement occurs when the organic photoconductor (1.0 g. in 0.5 ml. methylene chloride) is added to 25 ml. of a TiO dispersion in polyvinyl butyral resin and coated at 0.004 inch wet thickness on conducting paper. 

